Quarterly report pursuant to Section 13 or 15(d)

ACQUISITIONS AND DISPOSITIONS (Details)

v3.19.1
ACQUISITIONS AND DISPOSITIONS (Details)
3 Months Ended
Mar. 31, 2019
USD ($)
helicopter
Mar. 31, 2018
USD ($)
operating_facility
helicopter
Dec. 31, 2018
USD ($)
Property, Plant and Equipment [Line Items]      
Purchases of property and equipment $ 1,312,000 $ 3,784,000  
Interest capitalized during the period $ 0 $ 100,000  
Number of helicopter acquisitions | helicopter 0    
Number of helicopter dispositions | helicopter   12  
Operating facilities dispositions | operating_facility   2  
Proceeds from disposition of property and equipment $ 0 $ 19,497,000  
Construction in Progress      
Property, Plant and Equipment [Line Items]      
Interest capitalized in property and equipment $ 700,000   $ 700,000
S92 Heavy Helicopters      
Property, Plant and Equipment [Line Items]      
Number of helicopter acquisitions | helicopter   1